Given his remarkable improvisational skills, it’s no wonder Robin Williams appreciates the speed and unpredictability of tennis. A player since grade school, the San Francisco resident would give anything to improve his backhand. He still enjoys the occasional match when he’s not shooting a film (look for him in the comedy License to Wed, set to be released July 4th weekend) or doing stand-up. Williams is a fan of the pro game and a regular at the U.S. Open.

A lot of people in Hollywood play golf, yet you like tennis. Why?

Tennis is just much more physical. It’s chess at 90 miles per hour. The idea of playing, pushing, moving, and the constant strategy involved. In golf, if someone hit the ball back at you, now that would be interesting.

What are your memories from playing with Pete Sampras, Andre Agassi, and Billy Crystal at the “Night at the Net” charity in Los Angeles a few years back?

Being served at by Pete Sampras. We were having fun on the court and I said to Pete, “Bring it!” and when he brought it, it was like a particle. You realize, “OK, I’m ready!” and all of a sudden it was gone.

Which players impress you?

Roger Federer. It’s like watching the Terminator. He has it all. There is no weakness. Great first serve, great second serve, great ground strokes, amazing stamina, and speed.

Do you like Maria Sharapova?

Wonderful to watch. It’s weird when you watch women’s tennis now with all the grunting and shouting. It’s a bit like phone sex. So you have to be very careful not to get too excited.

Are there similarities between doing standup and playing tennis?

There are because, like stand-up, you have to be ready to move in all different ways. And there’s that kind of solo thing—it’s all you.

What are your best and worst shots?

Best shot is also my worst shot, my serve. Best shot without qualifications, my forehand. I have a good forehand. Worst shot is my backhand. If I could ever learn a two-handed backhand, I would sacrifice a small animal.